Antenna



FIG. 1 is a top plan view of an antenna, showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top perspective view thereof;

FIG. 5 is a top plan view showing only the top portion of the design, with the broken line environment not shown;

FIG. 6 is a front elevation view, with the broken line environment not shown; and,

FIG. 7 is a bottom plan view showing only the bottom portion of the design, with the broken line environment not shown.

The broken lines show environment only and form no part of the claimed design. 

CLAIM The ornamental design for an antenna, as shown and described. 